JP5438829B2  Precoding method, channel information feedback method, transmitter, receiver, and precoding codebook structure method  Google Patents
Precoding method, channel information feedback method, transmitter, receiver, and precoding codebook structure method Download PDFInfo
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 JP5438829B2 JP5438829B2 JP2012524093A JP2012524093A JP5438829B2 JP 5438829 B2 JP5438829 B2 JP 5438829B2 JP 2012524093 A JP2012524093 A JP 2012524093A JP 2012524093 A JP2012524093 A JP 2012524093A JP 5438829 B2 JP5438829 B2 JP 5438829B2
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 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
 H04L1/00—Arrangements for detecting or preventing errors in the information received
 H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
 H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
 H04L1/0028—Formatting
 H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04B—TRANSMISSION
 H04B7/00—Radio transmission systems, i.e. using radiation field
 H04B7/02—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas
 H04B7/04—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
 H04B7/06—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
 H04B7/0613—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
 H04B7/0615—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
 H04B7/0619—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
 H04B7/0636—Feedback format
 H04B7/0639—Using selective indices, e.g. of a codebook, e.g. predistortion matrix index [PMI] or for beam selection

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
 H04L1/00—Arrangements for detecting or preventing errors in the information received
 H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
 H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
 H04L25/00—Baseband systems
 H04L25/02—Details ; Arrangements for supplying electrical power along data transmission lines
 H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks ; Receiver end arrangements for processing baseband signals
 H04L25/03891—Spatial equalizers
 H04L25/03898—Spatial equalizers codebookbased design
 H04L25/0391—Spatial equalizers codebookbased design construction details of matrices
 H04L25/03923—Spatial equalizers codebookbased design construction details of matrices according to the rank
Description
【Technical field】
[0001]
The present invention relates to a multiinput, multipleoutput (MIMO) system precoding method, a system, and a precoding codebook structure method in the communication field. The present invention relates to a precoding method, a system, and a precoding codebook structure method.
[Background]
[0002]
Transmission in wireless communication Part And receiving Part If both use a plurality of antennas, a higher rate can be obtained by adopting a spatial multiplexing scheme, and thus the transmission rate can be improved. Receive Part Can be used to estimate the channel matrix that was passed through to acquire the transmitted signal by channel, so even after each antenna transmits different data, after passing through the multiple input, multiple output (MIMO) signal matrix , Receive Part The outgoing data at each antenna can be decoded as usual.
[0003]
There is an enhancement means that uses a precoding transmission technique for a method of directly decoding transmission data at each antenna using a channel matrix. Outgoing Part The concept of layer is defined as follows, and in the same timefrequency resource, each layer can transmit a different data code, and the number of layers is equal to the rank (Rank) of the channel matrix. After precoding processing on the data in the layer and mapping to the antenna, it is also received through the radio channel Part Transmit to. Outgoing Part With complete and accurate channel state information (CSI), singular value decomposition (SVD) can be performed on a specific channel matrix. Then, a precoding process is performed on each layer data using a matrix composed of right feature vectors obtained by decomposing the channel matrix as a precoding matrix.
[0004]
By the way, receive normally Part Only can directly and accurately get CSI, outgoing Part And trying to get CSI, receive Part Sent by Part There is no choice but to provide feedback on CSI information. In conventional mainstream standards, the feedback capacity provided by the system to CSI information is all finite, and the amount of feedback that feeds back all channel information is very maximal, so all mainstream feedback methods are all codebooks. The content of the feedback is quantization information of a matrix composed of the right feature value of the channel, and the quantization information is represented by a code word in the code book.
[0005]
The basic principle of precoding based on codebook feedback is as follows. If the finite feedback channel capacity is Bbps / Hz, the number of usable codewords is N = 2 ^{B} And all precoding matrices are quantized and codebook
[Expression 1]
Structure. Outgoing Part And receive Part Both store this codebook. Receives the channel matrix H obtained by estimating the channel each time. Part Depending on the setting criteria
[Expression 2]
Codeword from
[Equation 3]
Select (may be referred to as optimized codeword) and select the codeword
[Expression 4]
Call codeword number i Part To give feedback. Outgoing Part Precode codeword by this number i
[Equation 5]
And perform precoding on the transmission code block.
Normally,
[Formula 6]
Can be further divided into code books corresponding to a plurality of ranks (Rank), and in each Rank, a precoding matrix consisting of a right feature vector of a channel in the Rank is quantized corresponding to a plurality of values. . Since the rank of the channel and the number of nonzero right feature vectors are equal, normally, if Rank is Ν, all codewords have Ν sequences. Code book for this
[Expression 7]
Is divided into multiple subcodebooks according to Rank, and as shown in Table 1,
[Table 1]
Due to the limitation of feedback overhead, only the feedback based on the codebook can be adopted to transmit the precoding.
[0006]
Among them, when Rank> l, all codewords that need to be stored are in the form of a matrix. Among them, the codebook in the LTE protocol adopts the feedback method of codebook quantization and transmits 4 LTE downlinks. As shown in Table 2, the antenna codebook actually has the same meaning as the LTE precoding codebook and the channel information quantization codebook. In the following, for the sake of unification, it may be considered that the vector also has a matrix whose one dimension is 1.
[Table 2]
Among them,
[Equation 8]
And I is the identity matrix,
[Equation 9]
Is the matrix W _{k} Represents the j th column vector.
[Expression 10]
Is a matrix
[Expression 11]
The first
[Expression 12]
Represents a matrix of columns.
[0007]
With the development of communication technology, LTEAdavance demands higher demands on spectrum efficiency, and therefore, the number of antennas is also increased to 8 antennas. It is necessary to perform channel information quantization feedback.
[0008]
In the LTE standard, the minimum feedback unit of channel information is a subband (Subband), which is composed of multiple resource blocks (Resource Block, RB), and each RB is composed of multiple resource elements (Resource Element, RE). Therefore, RE is the minimum unit of timefrequency resources in LTE, and the LTE resource display method is used as it is for LTEA.
[0009]
In fact, in a system, since a loworder codebook is usually used most frequently, it expresses that codebook design of Rank = 1 and Rank = 2 is very important in codebook design. In the 4antenna (Tx) codebook, it has a relatively mature codebook structure method, but in the 8antenna, the transmission due to the increase of the antenna dimensions Part The mainstream application mode in Europe has switched from singlepolarization to dualpolarization antennas, so a new 8antenna codebook needs to be designed.
[0010]
In the codebook with 8 antennas Rank = l and Rank = 2, which normally contains two part codewords, partly thinking about matching the relevant channel characteristics and partly matching the unrelated channel Thinking about codewords for relevant channel characteristics is the most important idea. The codeword can minimize the quantization error for the channel information only by considering the channel model, antenna polarization state, and the like. Other codewords may be distributed as evenly as possible, and may be independent from codewords matching the related channel. Maximize the minimum chord distance between them so that the codewords are evenly distributed.
[0011]
For example, the front 8 DFT codewords of Rankl's 16 codewords in LTE are designed for the associated channel, suitable for the associated channel of a very single polarization antenna, and the last 8 codewords are It increases under the previous 8 codewords, and after increasing to 16 codewords as much as possible, these 16 codewords have a better distribution in the fourdimensional complex space.
[0012]
Of course, a codeword that matches the associated channel may also match the unrelated channel, and does not consider the best performance in the unrelated channel, but only includes codewords that match the associated channel in the codebook. For example, the technical scheme that emerged in the LTE study process is to codebook all 16 Rankl codewords using DFT codewords appropriate for the associated channel of a single polarization antenna.
[0013]
Normally, K codewords are matched (appropriate) to the associated channel in a codebook with Rank = 1 or Rank = 2. Other codewords match unrelated channels and this part of the codeword may be zero.
[0014]
In the conventional codebook technique, if the number of codewords of Rank = 1 or Rank = 2 is all 16, the number of codewords matching the related channel is 8 when Rank = 1 and Rank = 2.
[0015]
The following values in Table 3 are specified.
[Table 3]
Among them,
[Formula 13]
It is.
[0016]
Table 4 shows the codewords matching the relevant channels in the codebook of Rank = 1 and Rank = 2.
[Table 4]
Among them,
[Expression 14]
It is.
[0017]
By the way, after adopting Rank = 1 codebook precoding in the conventional technology, when single polarization and dual polarization antennas are adopted, the related channels are uniform within the cell direction (120 degrees or 180 degrees) The channel direction information of each UE in the cell cannot be quantized well without forming a beam distributed in the cell. In addition, the side lobe of the shaped beam was large, and the power of the main lobe was not sufficiently concentrated, causing a loss of performance. Among them, the beam diagram obtained when a single polarized antenna is employed is shown in FIG. 1 (the number of codewords matching the related channel is 8). When a dualpolarized antenna and related channels are used, the average quantization matching degree is 0.5 or less after a simulation experiment.
[0018]
In case of Rank = 2, considering the complexity and memory problem of the UE terminal implementation, the system selects and uses only one codebook, of which codebook 1 is a single polarization antenna The codebook 2 with Rank = 2 has good performance when the dual polarization antenna is used, but the performance is poor when the dual polarization antenna is used. In the case of a polarized antenna, the performance deteriorates.
SUMMARY OF THE INVENTION
[Problems to be solved by the invention]
[0019]
A technical problem to be solved by the present invention is applied to precoding when a channel matrix in an 8antenna MIMO system has a low rank, and provides a precoding method and system capable of improving precoding performance. That is.
[Means for Solving the Problems]
[0020]
To solve the above problem, the present invention provides a precoding method applied to an 8antenna multiinput, multioutput (MIMO) system, and the precoding method includes:
Outgoing Part And receive Part Both store precoding codebook information and receive it Part Selects one codeword from the precoding codebook according to the channel matrix estimated by the Part Feedback Part Finds the codeword by the number and receives the codeword by the codeword Part Precoding is performed on the code block to be transmitted, of which at least 8 codeword vectors in the precoding codebook or column vectors in at least 8 codeword matrices are from the following 8dimensional vector set: Based on the selected 8dimensional vector,
[Expression 15]
Among them,
[Expression 16]
[Expression 17]
S (n) is an element in the vector s,
[Formula 18]
Including.
The rank of the channel matrix is 1, the codeword of the precoding codebook is an 8dimensional codeword vector, of which at least some codeword vectors are selected from the 8D vector set. Obtained based on a vector of dimensions, or
The rank of the channel matrix is 2, the codeword of the precoding codebook is a codeword matrix including two columns, and the 8th dimension of the first column of at least a part of the codeword matrix in the precoding codebook A vector is obtained based on an 8dimensional vector selected from the 8dimensional vector set, and an 8dimensional vector of the second column of the at least some codeword matrix is
[Equation 19]
Based on an 8dimensional vector selected from the set consisting of:
[Expression 20]
,
[Expression 21]
And the first column and the second column of each codeword matrix are orthogonal to each other.
[0021]
The eightdimensional vector selected from the eightdimensional vector set is the following eight eightdimensional vectors,
[Expression 22]
Or
[Expression 23]
Among them, the same u as the eight 8dimensional vectors _{i} The values of n in an 8dimensional vector including the same are the same, and the values of n in different 8dimensional vectors are the same or different from each other.
[0022]
The 8dimensional vector selected from the 8dimensional vector set is the following 16 8dimensional vectors,
[Expression 24]
Or
[Expression 25]
Or
[Equation 26]
Or
[Expression 27]
Or
[Expression 28]
Or
[Expression 29]
Or
[30]
.
The eightdimensional vector selected from the eightdimensional vector set is the following 32 eightdimensional vectors:
[31]
Or
[Expression 32]
.
[0023]
Each codeword vector for matching to a related channel in the precoding codebook or an 8dimensional vector in the first column of each codeword matrix for matching to a related channel is all the 8dimensional vector set Based on an 8dimensional vector selected from
[0024]
When obtaining the first column of the codeword vector or codeword matrix of the precoding codebook based on the 8dimensional vector selected from the 8dimensional vector set, the directly selected 8dimensional vector is used as the precoding code. The first column of the codeword vector or codeword matrix of the book, or
When obtaining the first column of the codeword vector or codeword matrix of the precoding codebook based on the 8dimensional vector selected from the 8dimensional vector set, all the selected 8dimensional vectors are The 8dimensional vector obtained after multiplying by a constant and / or exchanging according to the same scheme is used as the first column of the codeword vector or codeword matrix of the precoding codebook.
[0025]
The method further comprises:
Outgoing call Part Employs a singlepolarized antenna and the transmission is performed regardless of whether or not row conversion is performed. Part When mapping each line and each antenna in the codeword, there are the first, fifth, second, sixth, third, seventh, fourth, and eighth elements of the selected 8dimensional vector in the codeword. Are mapped to each antenna arranged sequentially from the outermost antenna, or
Outgoing call Part Employs dual polarization antennas, whether or not to perform row conversion Part When mapping each row in the codeword to each antenna, the row in which the first to fourth elements of the selected 8dimensional vector in the codeword exist is sequentially in the first polarization direction Are mapped to four antennas arranged sequentially from the outermost antenna, and the second polarization direction is sequentially applied to the row in which the fifth to eighth elements of the selected 8dimensional vector exist in the codeword. Are mapped to four antennas arranged sequentially from the outermost antenna, and the outermost antennas in the two polarization directions are adjacent to each other.
[0026]
The rank of the channel matrix is 1, and K in the precoding codebook _{1} K codeword vectors selected from the 8dimensional vector set _{1} Obtained based on 8 dimensional vectors, K _{1} = 8, 16, 32 or 64, or
The rank of the channel matrix is 2, and in the precoding codebook, K _{2} K in which the 8dimensional vector in the first column of the codeword matrix is selected from the 8dimensional vector set _{2} Obtained based on 8 dimensional vectors, K _{2} = 8, 16, 32 or 64.
[0027]
Outgoing call Part And receive Part The precoding codebook information that
[Expression 33]
And a calculation method for calculating a code word in a precoding codebook using these fourdimensional vectors. It is.
[0028]
The precoding codebook is outgoing Part And receive Part In the plurality of codebooks, the index information corresponding to the codeword is fed back in the plurality of codebooks, and the index information corresponding to the codeword is designated in the plurality of codebooks. The precoding codebook is structured by one function, and the function transmits Part And receive Part Promise by.
[0029]
In order to solve the above problems, the present invention Part And receive Part Provides a multiinput, multioutput (MIMO) system with 8 antennas, including
Outgoing call Part Stores information of a precoding codebook, obtains a codeword in the precoding codebook by the precoding method, and receives the codeword Part Including the codeword found by the codeword number fed back and adopting the codeword Part Installed to precode the code block to be transmitted to
Receiving Part Stores the precoding codebook and selects one codeword from the precoding codebook according to the estimated channel matrix, and the number of the codeword is transmitted Part It will be installed to provide feedback.
[0030]
In order to solve the above problem, the present invention further provides a codeword structure method in a precoding codebook applied to an 8antenna multiinput, multioutput (MIMO) system,
8 fourdimensional vectors u _{1} ~ U _{8} And define one 4dimensional vector, of which
[Expression 34]
Among them,
[Expression 35]
And
An 8dimensional vector set including a plurality of 8dimensional vectors is created, and n = 1, 2, 3 or 4, and the 8dimensional vector set is
[Expression 36]
And
as well as,
Depending on the rank of the channel matrix, one of the following schemes is adopted to construct the codeword in the precoding codebook,
When the rank of the channel matrix is 1, the same method as the precoding method is adopted, a plurality of 8dimensional vectors are selected from the 8dimensional vector set, and based on the selected 8dimensional vector Obtain a codeword vector that matches the relevant channel in the precoding codebook,
When the rank is 2, the codeword matrix including two columns in the precoding codebook that matches the related channel is a codeword matrix, and adopts the same method as the precoding method, and the 8dimensional vector set Obtaining an 8dimensional vector of the first column of the codeword matrix based on the 8dimensional vector selected from
[Expression 37]
Based on an 8dimensional vector selected from the set consisting of, obtaining an 8dimensional vector in the second column of the codeword matrix,
[Formula 38]
The first column and the second column of each codeword matrix are orthogonal.
【Effect of the invention】
[0031]
The precoding codebook structure method of an embodiment of the present invention provides codewords that match relevant channels in the codebook when Rank = 1 and Rank = 2, and uses these codewords, When Rank = l, in the case of singlepolarized antenna and dualpolarized antenna, after precoding, a good beam is formed, and the quantization error is small. The codebook of Rank = 2 is provided, and the modes of the dualpolarized antenna and the singlepolarized antenna can be well adapted and have good performance.
[Brief description of the drawings]
[0032]
FIG. 1 is a diagram of a singlepolarized antenna beam (8 codewords) when the prior art Rank = 1.
FIG. 2a is a schematic diagram of one type of antenna model of an embodiment of the present invention.
FIG. 2b is a schematic diagram of another antenna model of the embodiment of the present invention.
FIG. 3 is a flow diagram of a method for constructing a codeword that matches an associated channel according to an embodiment of the present invention.
FIG. 4 is an exemplary single polarization antenna beam diagram when an embodiment of the present invention is K = 8.
FIG. 5 is an exemplary single polarization antenna beam diagram when an embodiment of the present invention is K = 16.
FIG. 6 is another exemplary single polarization antenna beam diagram when an embodiment of the present invention is K = 16.
BEST MODE FOR CARRYING OUT THE INVENTION
[0033]
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and specific implementation methods.
Sending to a multiinput, multioutput (ΜΙΜΟ) system with 8 antennas Part And receiving Part Including, outgoing Part And receive Part Together with storing and receiving precoding codebook information Part Transmits a codeword number after selecting a codeword from the precoding codebook according to a channel matrix obtained by estimating a channel. Part Feedback and outgoing Part The codeword found by the number is received Part Precoding is performed on the code block to be transmitted.
[0034]
In this example, when Rank = l, Part And receive Part Codewords that match the relevant channel in the information of the precoding codebook that is stored together must be selected from the vector set U of Table 5, when the U set is n = 1, 2, 3, 4 Is a set of all vectors obtained corresponding to
[Table 5]
Among them,
[39]
Are the eight vectors shown in Table 6,
[Table 6]
Among them,
[Formula 40]
It is.
In this example,
[Expression 41]
It is.
[0035]
4dimensional vector u _{i} The
[Expression 42]
According to the rules of vector operation,
[Equation 43]
Have
If the codeword that matches the relevant channel in the precoding codebook is K, then K is less than the number of codewords in the codebook, usually 8, 16, 32, 64, etc.
[0036]
In one example, K = 8 and the codewords matching the relevant channels included in the codebook are as shown in Table 7,
[0037]
[Table 7]
Among them, when n = 1, 2 or 3 or 4, four codebooks are obtained.
There may be mixed situations, i.e. different direction vectors (
(44)
Is a fourway vector), the values of n are different from each other. Thus, a larger number of different codebooks can be obtained in combination. It looks like the example shown in Table 8,
[Table 8]
Or the codewords that match the relevant channels included in the codebook are as shown in Table 9,
[Table 9]
n = 1 or 2 or 3 or 4 to obtain the other four kinds of codebooks.
[0038]
Similarly, it may be a mixed situation, with different values of n for vectors in different directions, thus resulting in a combination of more different codebooks. It looks like one example shown in Table 10,
[0039]
[Table 10]
FIG. 4 is a singlepolarization antenna beam diagram obtained by adopting the above codeword in the situation of a singlepolarization antenna and related channels, and forms a highly directional beam from the diagram.
In another example, K = 16 and the 16 codewords matching the associated channel included in the codebook are as shown in Table 11;
[Table 11]
Or as shown in Table 12,
[Table 12]
Or as shown in Table 13,
[Table 13]
Or as shown in Table 14,
[Table 14]
Or as shown in Table 15,
[Table 15]
Fig. 5 is a singlepolarization antenna beam diagram obtained by adopting the above codeword in the case of a singlepolarization antenna and related channels. As shown in the figure, a highly directional beam was formed. .
[0040]
Or K = 16 and the 16 codewords matching the relevant channels included in the codebook are as shown in Table 16;
[Table 16]
Or as shown in Table 17,
[Table 17]
Fig. 6 is a singlepolarization antenna beam diagram obtained by adopting the above codeword in the case of a singlepolarization antenna and related channels. As shown in the figure, a highly directional beam was formed. .
In another example, K = 32 and the codewords that match the relevant channels included in the codebook are as shown in Table 18,
[Table 18]
Or as shown in Table 19,
[Table 19]
Not only can these vectors be used to precode the transmitted data in the case of the associated channel to form a highly directional beam in the case of a single polarization antenna, In the case of the wave antenna, it is possible to form a beam having a strong directionality in each polarization direction dimension, a concentrated power, and a small side lobe. According to the results of simulation experiments for calculating the matching degree of quantization in the industry, the codeword adopting the present invention has an average quantization matching degree when adopting a dual polarization antenna, a strong associated channel and Rank = 1. It is 0.6 or more, the maximum reaches 0.9, and has good precoding performance.
In another embodiment, Rank = 2 and the codewords matching the relevant channels in the precoding codebook adopted in this embodiment are all codeword matrices including two columns, and the first column is the set U. The second column is selected from
[Equation 45]
Selected from the set,
[Equation 46]
It is. Furthermore, it is necessary to guarantee that the first column and the second column of the Rank = 2 codeword matrix are orthogonal.
[0041]
The codewords described in the above embodiments are all expanded by multiplying them by a constant, and the performance is not affected. The range of the absolute value of the constant is preferably between (0, 1) and may be 8PSK.
[Equation 47]
Etc. For Rank = 2 codewords, each column may be multiplied by the same constant or different constants, and expanded to have a specific value related to power. These transformations should be included in the present invention.
[0042]
Outgoing, as shown in Figure 2a Part When a dual polarization antenna is used, the mapping relationship between the codeword and the antenna described in the above embodiment is that the number beside each antenna indicates that the antenna maps to the line in the codeword. To represent. As shown in the drawing, the first to fourth rows (that is, the first to fourth elements of the selected 8dimensional vector) in the code word are sequentially arranged from the outermost antenna in the first polarization direction. The 5th to 8th rows in the codeword (ie, the 5th to 8th elements of the selected 8dimensional vector) sequentially from the outermost antenna in the second polarization direction Mapping is performed on four antennas arranged in sequence, and the outermost antennas in the two polarization directions are adjacent to each other. In the drawing, antennas in each polarization direction are arranged at equal intervals.
[0043]
In other embodiments, the codewords in the precoding codebook can also be obtained by exchanging for the selected 8dimensional vector, in which case the first to fourth elements are present in the selected 8dimensional vector. Are mapped to four antennas sequentially arranged from the outermost antenna in the first polarization direction, and rows having the fifth to eighth elements are sequentially mapped to the second polarization. Mapping to the four antennas arranged sequentially from the outermost antenna in the wave direction is sufficient. Does not affect precoding performance.
[0044]
For example, the codeword vector of the structure of the above embodiment is
[Formula 48]
Is
In another embodiment, the codeword vector obtained by distributing again to the codeword vector is
[Equation 49]
As
Among them,
[Equation 50]
Is the number of codewords matching the associated channel.
[0045]
In this case, it is necessary to adjust the mapping relationship between each row in the codeword and the antenna, and the adjusted mapping relationship is arranged at equal intervals in the first polarization direction as shown in FIG. The four antennas that are sequentially matched to the first, third, fifth, and seventh rows in the new codeword, and the four antennas that are arranged at equal intervals in the second polarization direction are the second, Map to lines 4, 6, and 8. However, the mapping relationship with the antenna is unchanged in the space for the row in which each element of the selected 8dimensional vector exists. U _{k} The rows in which (2) exists all correspond to the second antenna from the left in the first polarization direction in FIGS. 2a and 2b.
[0046]
Similar to that, outgoing Part Regardless of whether or not the line is exchanged for the situation in which a single polarized antenna is used Part Performs mapping between each row in the codeword and each antenna, there are first, fifth, second, sixth, third, fourth, eighth elements in the selected 8dimensional vector in the codeword What is necessary is just to map to each antenna in which the line currently performed is sequentially arranged from the outermost antenna.
[0047]
It must be emphasized that all codewords selected from the vector set must perform row exchange in the same manner, regardless of whether singlepolarized or dualpolarized antennas are used. It is.
[0048]
Correspondingly, the codeword structure method for matching the relevant channel in the precoding codebook includes the following steps as shown in FIG.
Step 110, first 8 fourdimensional vectors u _{1} ~ U _{8} And one 4dimensional vector s,
[0049]
[Equation 51]
(Of which,
[Formula 52]
Is included).
[0050]
Step 120 also creates an 8dimensional vector set including a plurality of 8dimensional vectors, where n = 1, 2, 3, 4,
[53]
including.
[0051]
Step 130, when the rank is 1, select K eightdimensional vectors from the eightdimensional vector set, and based on the K eightdimensional vectors, select the related channels in the precoding codebook. Get K codewords to match.
[0052]
The codeword method for selecting K 8D vectors from the 8D vector set and matching the related channels in the precoding codebook based on the K 8D vectors is explained in detail in the preamble. , Do not overlap here.
[0053]
When the rank is 2, the codeword that matches the related channel in the codebook of the precoding codebook is a codeword matrix including two columns, and adopts the same method as described above, and the 8dimensional vector set Based on the 8dimensional vector selected from the above, obtain the 8dimensional vector of the first column of the codeword matrix that matches the relevant channel,
[Formula 54]
Based on the K eightdimensional vectors selected from the set consisting of, obtaining an eightdimensional vector of the second column of the K codeword matrices,
[Expression 55]
The first column and the second column of each codeword matrix are orthogonal.
[0054]
What needs to be explained is that the 8dimensional vector described in this example is for obtaining a codeword vector or codeword matrix for matching the relevant channel in the precoding codebook, It should not be understood that codewords that match relevant channels, and codeword vectors or codeword matrices that match nonrelated channels can also employ these codewords.
[0055]
The code word matching the related channel adopted in the code book of Rank = 1 and Rank = 2 in the above embodiment is obtained by calculation using a conventional fourdimensional vector, and the structure becomes convenient. For this reason, in the embodiment of the present invention, Part And receive Part And the information of the precoding codebook stored together with may be the final codeword,
[56]
May store only data for calculating a part of the selected eightdimensional vector or all fourdimensional vectors and a calculation method for calculating a code word in a precoding codebook using these fourdimensional vectors. . At this time, and because there is no need to store a large amount of codebooks, storage space can be saved, which is important for facilities where storage resources are very rare, such as terminal commercials.
[0056]
The codeword matching the related channel adopted in the codebook of Rank = 1 and Rank = 2 in the above embodiment is precoding in the case of dual polarization antenna and single polarization antenna when Rank = l. After passing through, a good beam is formed and the quantization error is small. Based on this, codebook nesting is guaranteed, and even when Rank = 2, the modes of the dualpolarized antenna and the singlepolarized antenna can be well adapted and have good performance.
[0057]
The equivalent conversion of the above embodiment may be as follows.
[0058]
The precoding codebook information may be stored separately, for example,
Outgoing call Part And receive Part Precoding codebook information that is stored with
[Equation 57]
And a calculation method for calculating a code word in a precoding codebook by using the data for calculating a part of the selected eightdimensional vector or all fourdimensional vectors and these fourdimensional vectors.
[0059]
For the feedback method, the codeword W that needs feedback is
[Formula 58]
Or
[Formula 59]
And may be fed back separately.
[0060]
The equivalent switching method by feeding back the index number corresponding to W may be as follows.
[0061]
Feed back one index number, find the corresponding W1 in the codebook C1, feed back the other index number, find the corresponding W2 in the codebook C2, and W = f (W1, W2) and f is a function, for example
What needs feedback
[Expression 60]
And the actual feedback
[Equation 61]
Or
[62]
,
[Equation 63]
And
The function relationship promised by the receiving terminal is f,
Or
Feed back one index number, find the corresponding W1 in the codebook C1, fix the W2 value, W = f (W1, W2), f is a function, for example,
What needs feedback
[Expression 64]
And the actual feedback
[Equation 65]
Or
[Equation 66]
And
[Equation 67]
Fixed,
The function relationship promised by the receiving terminal may be f.
[0062]
The application range of the above embodiment is that, in the LTE standard, the minimum feedback unit of channel information is a subband, one subband is composed of a few RBs, and each RB (Resource Block) is a plurality of RBs. It consists of RE, and (Resource Element) RE is the minimum unit of timefrequency resource in LTE, and uses the LTE resource display method for LTEA.
[0063]
The codebook is used for feedback of broadband channel information, and is also used for feedback of subband channel information. In addition to the feedback, the enhancement accuracy of other code book feedback information, for example, a differential code book can be enhanced.
[0064]
The employee completes all or part of the steps in the method by instructing the relevant hardware by the program, and the program is stored in a computer readable storage medium, such as a readonly storage device, a disk or a CD. May be. Optionally, all or part of the steps of the embodiments can also be realized by one or more integrated circuits. Correspondingly, each module / unit in the embodiment can be realized in the form of hardware, and may be realized in the form of a software function module. The present invention is not limited to combining any particular type of hardware and software.
[Industrial applicability]
The precoding codebook structure method of the present invention provides codewords that match relevant channels in the codebook when Rank = 1 and Rank = 2, and uses these codewords to rank = 1 In the case of singlepolarized antenna and dualpolarized antenna, a good beam is formed after the precoding, and the quantization error is small. In addition to guaranteeing, a codebook of Rank = 2 is provided, and the modes of the dualpolarized antenna and singlepolarized antenna can be adapted well, and the performance is good.
Claims (24)
 A precoding method applied to a multiinput, multioutput (MIMO) system with 8 antennas,
Transmitting section stores information similar precoding codebook and receiving unit,
By the transmitting unit is the number of code words which receiver is fed back, select one codeword from among the precoding codebook, performing precoding to the code block to be transmitted to the receiver by the codeword Wherein at least 8 codeword vectors in the precoding codebook or column vectors in at least 8 codeword matrices are obtained based on an 8D vector selected from the following 8D vector set:
 The rank of the channel matrix estimated by the receiving unit is 1, the codewords of the precoding codebook are 8dimensional codeword vectors, and at least some of the codeword vectors of the 8dimensional vector set Based on an eightdimensional vector selected from, or
The rank of the channel matrix estimated by the reception unit is 2, the codeword of the precoding codebook is a codeword matrix including two columns, and the first of at least some codeword matrices in the precoding codebook An 8dimensional vector of columns is obtained based on an 8dimensional vector selected from the set of 8dimensional vectors, and the 8dimensional vector of the second column of the at least some codeword matrix is
 The eightdimensional vector selected from the eightdimensional vector set is the following eight eightdimensional vectors,
 The 8dimensional vector selected from the 8dimensional vector set is the following 16 8dimensional vectors,
 The eightdimensional vector selected from the eightdimensional vector set is the following 32 eightdimensional vectors:
 Each codeword vector for matching to a related channel in the precoding codebook or an 8dimensional vector in the first column of each codeword matrix for matching to a related channel is all the 8dimensional vector set 3. A method according to claim 1 or 2 obtained based on an eightdimensional vector selected from.
 When obtaining the first column of the codeword vector or codeword matrix of the precoding codebook based on the 8dimensional vector selected from the 8dimensional vector set, the directly selected 8dimensional vector is used as the precoding code. The first column of the codeword vector or codeword matrix of the book, or
When obtaining the first column of the codeword vector or codeword matrix of the precoding codebook based on the 8dimensional vector selected from the 8dimensional vector set, all the selected 8dimensional vectors are The method according to claim 1 or 2, wherein an 8dimensional vector obtained by multiplying by a constant and / or exchanging according to the same scheme is used as the first column of the codeword vector or codeword matrix of the precoding codebook.  The method further comprises:
8 wherein the transmitting unit adopts a single polarized antenna, regardless of whether or not to row conversion, the calling unit when performing the mapping between each row and each antenna in the code word, which is the selected in the code word A row in which the first, fifth, second, sixth, third, seventh, fourth, and eighth elements of the dimension vector are mapped to each antenna sequentially arranged from the outermost antenna sequentially, or
The calling unit adopts dual polarized antenna, regardless of whether or not to row conversion, the originating unit may, when performing the mapping between each row and each antenna in the codeword, the selection of the code words The row in which the 1st to 4th elements of the 8dimensional vector existed are sequentially mapped to the four antennas sequentially arranged from the outermost antenna in the first polarization direction, and the selected in the codeword The rows where the 8th to 8th elements of the 8dimensional vector exist are mapped to the four antennas sequentially arranged from the outermost antenna in the second polarization direction, and the two polarizations The method of claim 7, wherein the outermost antennas in the direction are adjacent.  The rank of the channel matrix estimated by the receiver is 1, and in the precoding codebook, K _{1} codeword vectors are based on K _{1} 8dimensional vectors selected from the 8dimensional vector set. Obtained, K _{1} = 8, 16, 32 or 64, or
Rank of the channel matrix the receiving section estimates is 2, the in the precoding codebook, K 8dimensional vector of the first row of K _{2} codewords matrix is selected from the vector set of the 8dimensional _{2} 3. A method according to claim _{2} , obtained based on eight 8dimensional vectors, wherein K2 = 8, 16, 32 or 64.  The information of the precoding code book similar to the reception unit stored by the transmission unit is
 The precoding codebook is divided and stored in a plurality of codebooks in a transmitting unit and a receiving unit , and when feeding back, the codeword corresponding index information is fed back in the plurality of codebooks, the method of claim 1, the contents corresponding index information code word is instructed to structure the precoding codebook by one function, wherein the function is promised by the receiving unit and the transmitting unit in.
 A channel information feedback method applied to a receiving unit of an 8antenna multiinput, multioutput (MIMO) system,
The receiver stores precoding codebook information similar to the transmitter,
The receiving unit selects one codeword from the precoding codebook according to the estimated channel matrix, and feeds back the codeword number to the transmitting unit,
Among them, at least 8 codeword vectors in the precoding codebook or column vectors in at least 8 codeword matrices are obtained based on an 8D vector selected from the following 8D vector set:
 The rank of the channel matrix is 1, the codeword of the precoding codebook is an 8dimensional codeword vector, of which at least some codeword vectors are selected from the 8D vector set. Obtained based on a vector of dimensions, or
The rank of the channel matrix is 2, the codeword of the precoding codebook is a codeword matrix including two columns, and the 8th dimension of the first column of at least a part of the codeword matrix in the precoding codebook A vector is obtained based on an 8dimensional vector selected from the 8dimensional vector set, and an 8dimensional vector of the second column of the at least some codeword matrix is
Among them,
 The eightdimensional vector selected from the eightdimensional vector set is the following eight eightdimensional vectors,
 The 8dimensional vector selected from the 8dimensional vector set is the following 16 8dimensional vectors,
 The eightdimensional vector selected from the eightdimensional vector set is the following 32 eightdimensional vectors:
 Each codeword vector for matching to a related channel in the precoding codebook or an 8dimensional vector in the first column of each codeword matrix for matching to a related channel is all the 8dimensional vector set 14. A method according to claim 12 or 13 obtained based on an eightdimensional vector selected from.
 When obtaining the first column of the codeword vector or codeword matrix of the precoding codebook based on the 8dimensional vector selected from the 8dimensional vector set, the directly selected 8dimensional vector is used as the precoding code. The first column of the codeword vector or codeword matrix of the book, or
When obtaining the first column of the codeword vector or codeword matrix of the precoding codebook based on the 8dimensional vector selected from the 8dimensional vector set, all the selected 8dimensional vectors are 14. A method according to claim 12 or 13, wherein an 8dimensional vector obtained after multiplying by a constant and / or exchanging according to the same scheme is the first column of the codeword vector or codeword matrix of the precoding codebook.  The rank of the channel matrix is 1, and K in the precoding codebook _{ 1 } K codeword vectors selected from the 8dimensional vector set _{ 1 } Obtained based on 8 dimensional vectors, K _{ 1 } = 8, 16, 32 or 64, or
The rank of the channel matrix is 2, and in the precoding codebook, K _{ 2 } K in which the 8dimensional vector in the first column of the codeword matrix is selected from the 8dimensional vector set _{ 2 } Obtained based on 8 dimensional vectors, K _{ 2 } The method according to claim 12 or 13, wherein = 8, 16, 32 or 64.  The information of the precoding code book similar to the reception unit stored by the transmission unit is as follows:
 The precoding codebook is divided and stored in a plurality of codebooks in the transmission unit and the reception unit, and feeds back the index information corresponding to the codeword in the plurality of codebooks when feeding back, and in the plurality of codebooks 13. The method according to claim 12, wherein the content indicated by the corresponding index information of the codeword constitutes the precoding codebook by one function, and the function is promised by the transmitter and the receiver.
 8 antenna multiinput, multioutput (MIMO) transmitter including transmitter and receiver,
An 8antenna multiinput, multioutput (MIMO) characterized by being installed by the method according to any one of claims 1 to 11 so as to perform precoding on a code block to be transmitted to a receiving unit. ) Outgoing part.  8 antenna multiinput, multioutput (MIMO) receiver,
The multiinput, multioutput (MIMO) of 8 antennas characterized in that the receiving unit is installed to feed back channel information to the transmitting unit by the method according to any one of claims 12 to 21. Receiver.  A codeword structure method in a precoding codebook, applied to an 8antenna multiinput, multioutput (MIMO) system, the method comprising:
8 fourdimensional vectors u _{ 1 } ~ U _{ 8 } And define one 4dimensional vector, of which
An 8dimensional vector set including a plurality of 8dimensional vectors is created, and n = 1, 2, 3 or 4, and the 8dimensional vector set is
as well as,
Depending on the rank of the channel matrix, one of the following schemes is adopted to construct the codeword in the precoding codebook,
When the rank of the channel matrix is 1, the same method as the precoding method described in any one of claims 1, 3, 4, 5, 6, 7, 8, or 9 is adopted. Selecting a plurality of 8D vectors from the 8D vector set, and obtaining a codeword vector matching a related channel in a precoding codebook based on the selected 8D vectors,
When the rank is 2, the codeword matching the relevant channel in the precoding codebook is a codeword matrix including two columns, and the claim 1, 3, 4, 5, 6, 7, 8, or 9 An 8dimensional vector of the first column of the codeword matrix based on an 8dimensional vector selected from the 8dimensional vector set, adopting the same method as the precoding method described in any one of the claims Get
Among them,
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